Marc at Pool Tile Dr. did an awesome job removing the white calcium line on my pool tile. He was professional, on time, courteous and thorough. It was like a miracle NOT to have to use pumice stone and HOURS of manual labor. In a matter of hours, the tile looked great. The grout lines, which are impossible to get clean manually, look terrific.
Definitely recommend Marc to clean your pool tile when you are tired of trying manual labor and still not getting off all the scum.